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    <h3>常用基础类型</h3>

    <h4>js已有</h4>
    <p>原始类型: string/number/boolean/underfined/null/symbol</p>
    <p>对象类型:object</p>

    <h4>ts新增</h4>
    <ol>
        <li>联合类型</li>
        <li>自定义类型</li>
        <li>接口</li>
        <li>元组</li>
        <li>字面量</li>
        <li>枚举</li>
        <li>void</li>
        <li>any</li>
    </ol>
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